Hafsa Azmat

Hi, I have a similar scenario where the truss is subjected to both wind and temperature loading. I have assigned a hinge and roller support to the truss; the roller is translating in both directions because of wind and temp loading. To accommodate movement, I am using a ball bearing with stopper plates to restrict excessive displacement while providing the necessary deflection allowance. My Questions: 1. If the ball bearing comes into contact with the stopper plate at its extreme deflection limit, will the connection start behaving like a hinge? If so, do I need to check my truss supporting beam for additional reactions due to hinge behavior? 2. Would using a Teflon bearing plate solve this issue, or would it also behave like a hinge once it reaches its displacement limit? ( I donot know teflon plate behaviour) For example, if the truss deflection exceeds the allowable displacement range of the Teflon plate, will it introduce unintended forces at the connection? just like roller and stopper plate connection Would appreciate insight, Thank you Please advice

Hi, I am using auto select list to pick a section for shear wall design. when i run analysis for second time, to revise auto selection i got this error " NO Load Cases to run". Also when i unlock the Model i got another warning. i am unable to comprehend this behavior please help.

either you do welding or make a bolted connection, your scheme of welds and bolts will gonna decide if your connection can takeup the moment or not

by composite beam i mean the steel beam supporting deck slab, and i want to design this beam as composite beam taking advantage of top rcc deck slab. i want to know the closest realistic method to achieve this behaviour. Esp is CSI SAP2000. thanx.

hi how can i model composite beam in sap2000 for close to accurate design and analysis TIA

HI I have a query about RCC structures supporting steel bin ( contains Rawmaterial ). Steel bin manufacturer has provided the steel bin dead load and material load. Material load stored in bin has huge weight. My question is that should i apply this Material load (which will be constant some times or varying) as Live Load or i should distribute this load in dead and live in certain percentage? Like 60% of Material Load as Dead load and the remaining 40 % as live load.? please suggest

hi -Can anybody help me out to find the method of seismic horizontal story load distribution on frames and at column nodes. I want to verify the nodes loads ETAB is giving me, and the story force is distributed in frame system. I am doing static linear analysis. -Story Shear = 781.84KN -Its single story model (for study purpose) -Grid dimensions and load distribution at nodes are visible in attached pic. TIA

i would say u just increase the deformed shape scale factor while watching dead case deformation cause its working for me.

check load case to run , may be you have 'turn' dead case in 'not to run cases'

from the pic, your area of allowable bearing capacity violation is large , better not to do average. Though the method of averaging is by importing nodal soil pressure table in excel and take joints avg.

Hi Sir, I am using Sap 18 for analysis. I had a look at assembled joint masses, where I see and located the joints showing -ve masses, but its program calculated and I don't want to alter that. I have not applied any loads to Slab mesh point. What I have done is, I have assigned my equipment pulling load in new Load pattern “L.L-Pull” and didn't added that Load Pattern in my Mass Source. That way I am not having warning for "-ve Mass source". And added that new Load Pattern in my Old Case “L.L” to counter it in member Design.

This is the warning i am getting from SAP.analysis

I m not adding -ve factors in mass source

Hi there I am analysing a building in which i have assigned some negative point loads cause of pull from my equipment loads in live case, when i m running analysis its is giving warning for negative values in mass source ( i have added that case in mass source as this case includes both gravity and pull forces) Is there any way not to delete those pulling loads and remove the warning in my mass source

I am intersted to knw th method adopted by tarzaghi as its results are closest to experimental work, i vl go through ur refrences on Reese

This is relation bw vertical subgrade reaction and bearing capacity not covering horizontal subgrade reaction

1. Can smbdy help me on how i can workout and model horizontal subgrade reaction on pile , 2. also the subgrade reaction kh vl be contant through out pile length or vary , 3. the method will be same for clay and sand or there are different method for each.

from your screen shots, i extracted, auto mesh in your first case is telling opening in slab plan in mid where it showing upward lifting from slab, slab thickness is more than usual (a screen shot of ur framing will clearify my doubt) in ur manual meshing the same result at mid beam is showing but the at beam end ways it is showing the manual meshing of th two slab is very close as it is showing up and down loading from slab, (make the nodes of two slab concide it will work ) wat are your slab modifiers

though my warning has been removed by correcting and re drawing slab area, and i think this error is related to inverse jacobian i-e cause of close meshing in slab element

12-2-18.LOG

Hi I am having warning type "cnstr" in my etab program, can any body guide what this warning is about and how to end it. TIA

your assumption should have reason, u can take your decision as per local and regional material quality and quality of work being done.

there are companies in Pakistan which do buy license for commercial analysis programs, my company does and they purchase it online.

Hey Can sm body help me to understand what this membrane drilling rotational stiffness, perpendicular to plane is about ?

I have read it but by even turning off frame auto meshing , csi manual says there is sm internal meshing of frame objects .( Which i am interested in) If you take a simply supported beam, with no intermediate joints, and turn off the frame auto meshing, program will still subdivide it in elements fr analysis purpose.